why does my Ram 1500 DT (2019-Present) check engine light keep coming on

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the battery's negative terminal to ensure safety while working on electrical components.

2. Address Error Codes

• Review the OBD-II scanner codes and identify the specific issue (e.g., P0420 for catalytic converter efficiency).
• Research the specific code to understand the likely causes and recommended repair actions.

3. Inspect and Replace Components

• For Fuel System Issues (e.g., P0171/P0174):

  • Inspect fuel injectors for clogs and clean or replace as necessary.
  • Check the fuel filter and replace if clogged.

• For Ignition System Issues (e.g., P0300):

  • Inspect spark plugs and ignition coils; replace worn or faulty components.

• For Emission Control Issues (e.g., P0420):

  • Inspect the catalytic converter for damage or clogging; replace if necessary.
  • Check oxygen sensors and replace if faulty.

4. Reassemble and Reconnect

• Reconnect any removed components, ensuring all connections are secure and tight.
• Reconnect the battery's negative terminal.

5. Clear Error Codes

• Using the OBD-II scanner, clear any stored error codes from the vehicle's ECU.

6. Test Drive

• Take the vehicle for a test drive to ensure the check engine light does not re-illuminate and that performance has returned to normal.